Bad service fro MTN

MTN I app**** for a cellphone contract with MTN online I was talking to a white female that for sure I don't recall her name. She told me the will send a message or a request for me to accept so that they will be able debit their money well I had bad signal I told her that I won't be able to accept because it was difficult for me to log in into my app account, due to I wanted this cellphone we talked and after them not sending the comfirmation to me again I thought maybe I won't get the cellphone well I was not able to reach to them they were the one who are calling me. Then days goes I got a call from them again they told me my cellphone will be delivered I ask the lady again to send those things so I will comfirm their payment she told me after I got the phone or the day they deliver the cellphone automatically they will send so I will be able to accept.... Well the cellphone got delivered I asked the guy about the payment he told me He does not know anything about that and everything was done. Well month goes I tried to call MTN they would send me those another call centre and no one was able to help me, months goes without paying them they never contacted me last year November if am not mistaken I got a call from a lady she told me that MTN handed over to them that I don't want to pay for the contract I explained everything to her and we negotiated about the payment and we agreed that the will take R1000 per month now I can't do anything they are saying am owing MTN R30 000 they put me on default and it was not my fault that they did not send the comfirmation so I will be able to accept even now am tying to call the I can't. I want to buy a car MTN closed everything for me am unable to do anything